noun: (linguistics) A member of a 19th-century school of German linguists who first advanced the theory of regular sound change; or a follower of that school.
adjective: Of or pertaining to the Neogrammarian school.
noun: Alternative form of Neogrammarian [(linguistics) A member of a 19th-century school of German linguists who first advanced the theory of regular sound change; or a follower of that school.]